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            Elephant Toothpaste
                
                    
                        
                            Season 3
                        
                    
                    
                        
                            Episode 25
                        
                    
                
            
            
            You might have seen this wacky experiment in a chemistry class or on late-night TV. Dropping a mixture into some hydrogen peroxide produces a huge foamy flume. But what’s actually causing that big mess? Turns out it’s a great illustration of a key concept in chemistry: catalysts.
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          10:38
        
      
    
  
  
                    
                
            An email from a subscriber made us question everything we thought we knew about trees.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          21:33
        
      
    
  
  
                    
                
            The 15 ways that color happens. It's all about the electrons. Well, almost.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          12:07
        
      
    
  
  
                    
                
            This element powers glow in the dark exit signs, keychains, and costs $30,000 per gram.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          9:53
        
      
    
  
  
                    
                
            Scientific fraud rocked the Alzheimer’s research community. Did it help point to a cure?
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          12:54
        
      
    
  
  
                    
                
            Alex Dainis explores whether or not your milk needs to be pasteurized. Yes, it really does.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
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            George tests a revolutionary new way to stick stuff together.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
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            Sometimes the difference between life-saving drug and deadly side effect is chirality.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          17:23
        
      
    
  
  
                    
                
            What happens when you eat morel mushrooms.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          10:31
        
      
    
  
  
                    
                
            WARNING: this video contains incredible macro footage of supercooled water droplets nucleating ice.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          13:12
        
      
    
  
  
                    
                
            Let’s dive into the science behind ocean alkalinization!
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          16:56
        
      
    
  
  
                    
                
            Discover why curdled milk is the key to the best cocktail you’ll ever taste.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          10:13
        
      
    
  
  
                    
                
            Scientists are finding the building blocks of carbon ring structures… out in space!